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display electronics units (DEU)s.
Airborne Vibration Monitoring Signal Conditioner
The airborne vibration monitoring (AVM) signal conditioner
calculates and monitors vibration levels of each engine.
The AVM signal conditioner receives analog input from these
engine sensors:
* N1 speed sensor
* N2 speed sensor
* Number 1 bearing vibration sensor
* Fan frame compressor case vertical vibration (FFCCV)
sensor.
The DEUs and the flight data acquisition unit (FDAU) receive
AVM information through an ARINC 429 data bus.
DEUs
The DEUs use digital input from the EEC to show these engine
parameters on the common display system (CDS):
* N1
* N2
* EGT.
The DEUs use their analog N1 and N2 signals as alternate
inputs when the EEC does not have electrical power. EGT
shows only when the EEC has electrical power. See the ENGINE
FUEL AND CONTROL for more information about the EEC
power sources. (SECTION 73-21)
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General
The engine indicating system lets you see exceedance data for
these engine parameters:
* N1
* N2
* EGT RED LIMIT
* EGT HOT START.
The exceedance data is important for maintenance practices.
You find these actions in part II of the airplane maintenance
manual (AMM). You need this information for selection of the
correct maintenance action:
* Highest value (peak) of the parameter during the
exceedance
* Time above redline limit.
If there is an exceedance stored in memory for the current flight
leg, the box around the digital readout shows red when these
conditions occur:
* Both start levers in the CUTOFF position
* Both engine start switches in the OFF position
* EEC BITE not in use
* N2 for both engines less than 10%.
The engine indicating system shows engine 2 data the same as
engine 1.
The engine indicating system starts a new leg for exceedances
when the airplane speed is more than 80 knots.
ENGINE/EXCEED BITE Page
The ENGINE/EXCEED BITE page lets you pick engine BITE or
EXCEEDANCES.
EXCEEDANCE MENU
The EXCEEDANCE MENU page lets you see exceedance data
for ENGINE 1 or ENGINE 2.
Training Information Point
The DEUs keep exceedance data in non-volatile memory. These
circuit breakers must be closed when you get exceedance data
to make sure the data stored in each DEU is the same:
* DISPLAY, DEU 1 HOLDUP (P6 panel)
* DISPLAY, DEU 2 HOLDUP (P6 panel)
* DISPLAY, DEU 2 PRI (P6 Panel)
* DISPLAY, DEU 1 PRI (P18 panel).
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General
If there are current exceedances for engine 1, the CDU shows
the ENGINE 1 CURRENT EXCEEDANCES SUMMARY page
when you select ENGINE 1 on the EXCEEDANCE MENU. A
current exceedance is an exceedance that occurs during the
current leg and was not reset.
The engine indicating system starts a new leg for exceedances
when the airplane speed is more than 80 knots.
The engine indicating system shows engine 2 data the same as
engine 1. Only engine 1 exceedance CDU pages show on this
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